Pinless Moisture MeterKlein Tools ET140 is designed to non-invasively detect hidden moisture content up to 3/4-Inch (19 mm) depth. Easily select between materials with mode button to test surface of drywall, masonry, hardwood, and softwood. The ET140 has easy viewing with bright, reverse-contrast display and LED bar graph. Features;Pinless, electromagnetic field (EMF) technology allows for nondestructive detection of moisture content in building materialsDetects moisture content up to 3/4-Inch (19 mm) deepEasy viewing with bright reverse-contrast displayNine LED bars indicate moisture rangeEasy-to select materials with mode button; drywall, masonry, hardwood, and softwoodHold, Low battery, and Auto-Power off functionsBuilt to withstand a 6.6 foot (2 m) dropIncludes detector, 9V battery, and instruction manualSpecifications:Batteries: 9VDrop Protection: 6.6' (2M)Material: ABS PlasticExternal Electrode: NoneDisplay Resolution: 0.1%Display: Bright Reverse-Contrast Display and a Nine LED Bar Graph Sensing Depth: 3/4" (19 mm)WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.